A customer approaches the closed Riverview Gun Sales shop on Dec. 21 in East Windsor, Conn. The Bureau of Alcohol, Tobacco, Firearms and Explosives raided the store and shut it on Dec 20.

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The owner of the gun store that sold Nancy Lanza the Bushmaster rifle used in the Newtown massacre pleaded guilty Thursday to federal charges stemming from gun sales to two other customers.

David LaGuercia, owner of Riverview Gun Sales in East Windsor, pleaded guilty in U.S. District Court to misdemeanor charges of transferring a firearm before completing a background check and failing to maintain proper firearm records. The company, also pleaded guilty through him to a misdemeanor charge of making false entries in dealer's records from January 2010 through December 2012.